US5602253A - Peptides derivatives - Google Patents

Peptides derivatives Download PDF

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US5602253A
US5602253A US08/468,046 US46804695A US5602253A US 5602253 A US5602253 A US 5602253A US 46804695 A US46804695 A US 46804695A US 5602253 A US5602253 A US 5602253A
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pab
cha
mmol
pro
nmr
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Karl T. Antonsson
Ruth E. Bylund
Nils O. I. Nilsson
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AstraZeneca AB
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/06—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
    • C07D239/08—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with hetero atoms directly attached in position 2
    • C07D239/12—Nitrogen atoms not forming part of a nitro radical
    • C07D239/14—Nitrogen atoms not forming part of a nitro radical with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, attached to said nitrogen atoms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/02—Nasal agents, e.g. decongestants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/06—Antiasthmatics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P19/00—Drugs for skeletal disorders
    • A61P19/02—Drugs for skeletal disorders for joint disorders, e.g. arthritis, arthrosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P7/00—Drugs for disorders of the blood or the extracellular fluid
    • A61P7/02—Antithrombotic agents; Anticoagulants; Platelet aggregation inhibitors
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C271/00—Derivatives of carbamic acids, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups
    • C07C271/62—Compounds containing any of the groups, X being a hetero atom, Y being any atom, e.g. N-acylcarbamates
    • C07C271/64—Y being a hydrogen or a carbon atom, e.g. benzoylcarbamates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D205/00—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom
    • C07D205/02—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings
    • C07D205/04—Heterocyclic compounds containing four-membered rings with one nitrogen atom as the only ring hetero atom not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D207/04—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D207/08—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon radicals, substituted by hetero atoms, attached to ring carbon atoms
    • C07D207/09—Radicals substituted by nitrogen atoms, not forming part of a nitro radical
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D211/00—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings
    • C07D211/04—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
    • C07D211/08—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms
    • C07D211/18—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms
    • C07D211/26—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms with hydrocarbon radicals, substituted by nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
    • C07K5/02—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link
    • C07K5/022—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link containing the structure -X-C(=O)-(C)n-N-C-C(=O)-Y-; X and Y being heteroatoms; n being 1 or 2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
    • C07K5/02—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link
    • C07K5/022—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link containing the structure -X-C(=O)-(C)n-N-C-C(=O)-Y-; X and Y being heteroatoms; n being 1 or 2
    • C07K5/0222—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link containing the structure -X-C(=O)-(C)n-N-C-C(=O)-Y-; X and Y being heteroatoms; n being 1 or 2 with the first amino acid being heterocyclic, e.g. Pro, Trp
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
    • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
    • C07K5/06—Dipeptides
    • C07K5/06008—Dipeptides with the first amino acid being neutral
    • C07K5/06078—Dipeptides with the first amino acid being neutral and aromatic or cycloaliphatic
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
    • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
    • C07K5/06—Dipeptides
    • C07K5/06139—Dipeptides with the first amino acid being heterocyclic
    • C07K5/06165—Dipeptides with the first amino acid being heterocyclic and Pro-amino acid; Derivatives thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

Definitions

  • This invention relates to new competitive inhibitors of trypsin-like serine proteases, especially thrombin and kininogenases such as kallikrein, their synthesis, pharmaceutical compositions containing the compounds as active ingredients, and the use of the compounds as thrombin inhibitors and anticoagulants and as antiinflammatory inhibitors, respectively.
  • the invention also relates to novel use of compounds as starting materials in synthesis of a serine protease inhibitor. Furthermore the invention relates to a novel structural fragments in serine protease inhibitors.
  • Blood coagulation is the key process involved in both haemostasis (i.e. prevention of blood loss from a damaged vessel) and thrombosis (i.e. the pathological occlusion of a blood vessel by a blood clot).
  • Coagulation is the result of a complex series of enzymatic reactions, where one of the final steps is conversion of the proenzyme prothrombin to the active enzyme thrombin.
  • Thrombin plays a central role in coagulation. It activates platelets, it converts fibrinogen into fibrin monomers, which polymerise spontaneously into filaments, and it activates factor XIII, which in turn crosslinks the polymer to insoluble fibrin. Thrombin further activates factor V and factor VIII in a positive feedback reaction. Inhibitors of thrombin are therefore expected to be effective anticoagulants by inhibition of platelets, fibrin formation and fibrin stabilization. By inhibiting the positive feedback mechanism they are expected to excert inhibition early in the chain of events leading to coagulation and thrombosis.
  • Kininogenases are serine proteases that act on kininogens to produce kinins (bradykinin, kallidin, and Met-Lys-bradykinin). Plasma kallikrein, tissue kallikrein, and mast cell tryptase represent important kininogenases.
  • Kinins are generally involved in inflammation.
  • the active inflammation process is associated with increased permeability of the blood vessels resulting in extravasation of plasma into the tissue.
  • the ensuing plasma exudate contains all the protein systems of circulating blood.
  • the plasma-derived kininogens inevitably will be interacting with different kallikreins, forming kinins continually as long as the active plasma exudation process is ongoing.
  • Plasma exudation occurs independent of the mechanisms that are involved in the inflammation, whether it is allergy, infection or other factors (Persson et al., Editorial, Thorax, 1992, 47: 993-1000).
  • Plasma exudation is thus a feature of many diseases including asthma, rhinitis, common cold, and inflammatory bowel diseases. Particulary in allergy mast cell tryptase will be released (Salomonsson et al., Am. Rev. Respir. Dis., 1992, 146: 1535-1542) to contribute to kinin formation and other pathogenic events in asthma, rhinitis, and intestinal diseases.
  • the kinins are biologically highly active substances with smooth muscle effects, sectretory effects, neurogenic effects, and actions that may perpetuate inflammatory processes including activation of phospholipase A 2 and increasing vascular permeability. The latter action potentially induces a vicious circle with kinins providing for the generation of more kinins etc.
  • Tissue kallikrein cleaves primarily low molecular weight kininogen to produce kallidin and plasma kallikrein preferably releases bradykinin from high molecular weight kininogen.
  • Inhibitors of thrombin based on the amino acid sequence around the cleavage site for the fibrinogen A ⁇ chain were first reported by Blowback et al. in J. Clin. Lab. Invest. 24, suppl 107, 59, (1969), who suggested the sequence Phe-Val-Arg (P9-P2-P1, herein referred to as the P3-P2-P1 sequence) to be the best inhibitor.
  • Inhibitors of thrombin based on peptide derivatives with a cyclic aminoalkyl guanidine, e.g. 3-aminomethyl-1-amidinopiperidine, in the P1-position have been disclosed in EP-A2-0,468,231.
  • EP-A2-0,185,390 has S. Bajusz et. al. disclosed that replacing the agmatine with an arginine aldehyde gave a thrombin inhibitor which had much higher potency.
  • esters and amides containing the H-DPro-Phe-Arg sequence were reported by Fareed et al. in Ann. N.Y. Acad. Sci. 1981, 370: 765-784 to be plasma kallikrein inhibitors.
  • EP-A2-0,195,212 describing peptidyl ⁇ -keto esters and amides
  • EP-A1-0,362,002 describing fluoroalkylamide ketones
  • EP-A2-0,364,344 describing ⁇ , ⁇ , ⁇ -triketo compounds possessing different peptidase inhibiting properties.
  • kininogenase inhibitors e.g. kallikrein inhibitors based on derivatives of arginine.
  • EP-A1-0,530,167 describing ⁇ -alkoxy ketone derivatives of arginine as thrombin inhibitors.
  • An object of the present invention is to provide novel and potent trypsine-like serine protease inhibitors, especially anticoagulantia and antiinflammatory compounds with competitive inhibitory activity towards their enzyme i.e. causing reversible inhibition. More specifically anticoagulants for prophylaxis and treatment of thromboembolic diseases such as venous thrombosis, pulmonary embolism, arterial thromoosis, in particular myocardial infarction and cerebral thrombosis, general hypercoagulable states and local hypercoagulable states, e.g. following angioplasty and coronary bypass operations, and other situations where thrombin is believed to play a role, e.g.
  • a further object is to obtain thrombin inhibitors which are orally bioavailable and selective in inhibiting thrombin over other serine proteases.
  • a further object of the invention is to obtain kininogenase inhibitors which can be given orally, rectally, topically e.g. dermally, or via the inhalation route.
  • compounds of the general Formula I are potent inhibitors of serine proteases, especially thrombin and kininogenases such as kallikrein:
  • a 1 represents a structural fragment of Formula IIa, IIb, IIc, IId or IIe; ##STR2## wherein: k is an integer 0, 1, 2, 3 or 4;
  • n is an integer 1, 2, 3 or 4;
  • q is an integer 0, 1, 2 or 3;
  • R 1 represents H, an alkyl group having 1 to 4 carbon atoms, or R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted in the position which is alpha to the carbonyl group, and the alpha substituent is a group R 17 --(CH 2 ) p --, wherein p is 0,1 or 2 and R 17 is methyl, phenyl, OH, COOR 12 , CONHR 12 , where R 12 is H or an alkyl group having 1 to 4 carbon atoms, and R 11 is H or an alkyl group having 1 to 6 carbon atoms, or
  • R 1 represents Ph(4--COOR 12 )--CH 2 --, where R 12 is as defined above, or
  • R 1 represents R 13 --NH--CO--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 13 is H or an alkyl group having 1 to 4 carbon atoms or --CH 2 COOR 12 , where R 12 is as defined above, or
  • R 1 represents R 12 OOC--CH 2 --OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 12 is as defined above, or
  • R 1 represents R 14 SO 2 --, Ph(4--COOR 12 )--SO 2 --, Ph(3--COOR 12 )--SO 2 --, Ph(2--COOR 12 )--SO 2 --, where R 12 is as defined above and R 14 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--R 15 , wherein R 15 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--OR 15 , where R 15 is as defined above, or
  • R 1 represent --CO--(CH 2 ) p --COOR 12 , where R 12 is as defined above and p is an integer 0, 1 or 2, or
  • R 1 represents --CH 2 PO(OR 16 ) 2 , --CH 2 SO 3 H or --CH 2 --(5-(1H)-tetrazolyl), where R 16 is, individually at each occurrence, H, methyl or ethyl;
  • R 2 represents H or an alkyl group having 1 to 4 carbon atoms or R 21 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and, where R 21 is H or an alkyl group having 1 to 4 carbon atoms;
  • R 3 represents an alkyl group having 1-4 carbon atoms, and the alkyl group may or may not carry one or more flourine atoms, or
  • R 3 represents a cyclopentyl, cyclohexyl- or a phenyl group which may or may not be substituted with an alkyl group having 1 to 4 carbon atoms, or
  • R 3 represents a phenyl group substituted with a OR 31 group, where R 31 is H or an alkyl group having 1 to 4 carbon atoms and k is 0, 1, or
  • R 3 represents a 1-naphthyl or 2-naphthyl group and k is 0, 1, or
  • R 3 represent a cis- or trans-decalin group and k is 0, 1, or
  • R 3 represents 4-pyridyl, 3-pyrrolidyl or 3-indolyl which may or may not be substituted with a OR 31 group, where R 31 is as defined above and k is 0, 1, or
  • R 3 represents Si(Me) 3 or CH(R 32 ) 2 , wherein R 32 is a cyclohexyl- or a phenyl group;
  • R 4 represents H, an alkyl group having 1 to 4 carbon atoms, a cyclohexyl- or a phenyl group;
  • a 2 represents a structural fragment of Formula IIIa, IIIb or IIIc ##STR3## wherein: p is an integer 0, 1 or 2;
  • n is an integer 1, 2, 3 or 4;
  • Y represents a methylene group
  • Y represents an ethylene group and the resulting 5-membered ring may or may not carry one or two fluorine atoms, a hydroxy group or an oxo group in position 4, or may or may not be unsaturated, or
  • Y represents --CH 2 --O--, --CH 2 --S--, --CH 2 --SO--, with the heteroatom functionality in position 4, or
  • Y represents a n-propylene group and the resulting 6-membered ring may or may not carry in position 5 one fluorine atom, a hydroxy group or an oxo group, carry two fluorine atoms in one of positions 4 or 5 or be unsaturated in position 4 and 5, or carry in position 4 an alkyl group with 1 to 4 carbon atoms, or
  • Y represents --CH 2 --O--CH 2 --, --CH 2 --S--CH 2 --, --CH 2 --SO--CH 2 --, or
  • Y represent --CH 2 --CH 2 --CH 2 --CH 2 --CH 2 --;
  • R 3 is as defined above;
  • R 5 represents H or an alkyl group having 1 to 4 carbon atoms, or
  • R 5 represents --(CH 2 ) p --COOR 51 , where p is 0, 1 or 2 and R 51 is H or an alkyl group having 1 to 4 carbon atoms;
  • n is an integer 0, 1, 2, 3 or 4;
  • B represents a structural fragment of Formula IVa, IVb, IVc or IVd ##STR4## wherein: r is an integer 0 or 1;
  • X 1 represent CH 2 , NH or is absent
  • X 2 represents CH 2 , NH or C ⁇ NH
  • X 3 represents NH, C ⁇ NH, N--C(NH)--NH 2 , CH--C(NH)--NH 2 , CH--NH--C(NH)--NH 2 or CH--CH 2 --C(NH)--NH 2 ;
  • X 4 represents CH 2 or NH
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--C(NH)--NH 2 and r is 0, 1, or,
  • X 1 , X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0, 1, or
  • X 1 and X 3 are NH, X 2 is C ⁇ NH, X 4 is CH 2 and r is 0, 1, or
  • X 1 and X 4 are CH 2 , X 2 is C ⁇ NH, X 3 is NH and r is 0, 1, or
  • X 1 is CH 2 , X 2 and X 4 are NH, X 3 is C ⁇ NH and r is 1, or
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--NH--C(NH)--NH 2 and r is 0, 1, or
  • X 1 is absent, X 2 and X 4 are CH 2 , X 3 is CH--C(NH)--NH 2 and r is 0, or
  • X 1 is absent, X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0;
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--C(NH)--NH 2 and r is 1;
  • X 1 , X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0 or 1;
  • X 1 is absent, X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0;
  • X 1 and X 3 are NH, X 2 is C ⁇ NH, X 4 is CH 2 and r is 1;
  • X 5 represents C(NH)--NH 2 or NH--C(NH)--NH 2 ;
  • R 6 is H or an alkyl group having 1-4 carbon atoms
  • X 6 represents CH or N
  • Compounds of Formula I having S-configuration on the A 2 amino acid are preferred ones, of those compounds also having R-configuration on the A 1 amino acid are particularly preferred ones.
  • an alkyl group having 1 to 4 carbon atoms may be straight or branched unless specified otherwise.
  • An alkyl group having 1 to 4 carbon atoms may be methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl and t-butyl.
  • an alkyl group having 1 to 6 carbon atoms may be straigh or branched unless specified otherwise.
  • An alkyl group having 1 to 6 carbon atoms may be methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, i-pentyl, t-pentyl, neo-pentyl, n-hexyl or i-hexyl.
  • unsaturation is referred to, a carbon-carbon double bond is intended.
  • a 1 represents a structural fragment of Formula IIa, IIb, IIc or IId, preferably IIa or IIb;
  • k is an integer 0, 1, 2, 3 or 4, preferably 0, 1;
  • q is an integer 0, 1, 2 or 3, preferably 1;
  • R 1 represents H, an alkyl group having 1 to 4 carbon atoms, R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted in the position which is alpha to the carbonyl group, and the alpha substituent is a group R 17 --(CH 2 ) p --, wherein p is 0,1 or 2 and R 17 is methyl, phenyl, OH, COOR 12 , CONHR 12 , where R 12 is H or an alkyl group having 1 to 4 carbon atoms, and R 11 is H or an alkyl group having 1 to 6 carbon atoms, or
  • R 1 represents Ph(4--COOR 12 )--CH 2 --, where R 12 is as defined above, or
  • R 1 represents R 13 --NH--CO--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 13 is H or an alkyl group having 1 to 4 carbon atoms or --CH 2 COOR 12 where R 12 is as defined above, or
  • R 1 represents R 12 OOC--CH 2 --OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 12 is as defined above, or
  • R 1 represents R 14 SO 2 --, Ph(4--COOR 12 )--SO 2 --, Ph(3--COOR 12 )--SO 2 --, Ph(2--COOR 12 )--SO 2 -- where R 12 is as defined above and R 14 is an alkylgroup having 1-4 carbon atoms, or
  • R 1 represents --CO--R 15 , wherein R 15 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--OR 15 , where R 15 is as defined above, or
  • R 1 represent --CO--(CH 2 ) p --COOR 12 , where R 12 is as defined above and p is an interger 0, 1 or 2, or
  • R 1 represents --CH 2 PO(OR 16 ) 2 , --CH 2 SO 3 H or --CH 2 --(5-(1H)-tetrazolyl), where R 16 is, individually at each occurrence, H, methyl or ethyl;
  • R 1 represents R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and R 11 is H.
  • R 2 represents H or an alkyl group having 1 to 4 carbon atoms, or R 21 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and R 21 is H or an alkyl group having 1 to 4 carbon atoms;
  • R 3 represents an alkyl group having 1-4 carbon atoms, and the alkyl group may or may not carry one or more fluorine atoms, or
  • R 3 represents a cyclopentyl, cyclohexyl- or a phenyl group which may or may not be substituted with an alkyl group having 1 to 4 carbon atoms, or
  • R 3 represents a 1-naphthyl or 2-naphthyl group and k is 0, 1, or
  • R 3 represent a cis- or trans-decalin group and k is 0, 1, or
  • R 3 represents Si(Me) 3 or CH(R 32 ) 2 , wherein R 32 is a cyclohexyl- or phenyl group;
  • R 4 represents an alkyl group having 1 to 4 carbon atoms, a cyclohexyl or a phenyl group, preferably a cyclohexyl or a phenyl group;
  • a 2 represents a structural fragment of Formula IIIa, IIIb or IIIc, preferably IIIa;
  • p is an interger 0, 1 or 2;
  • n is an integer 1, 2, 3 or 4, preferably 2, 3;
  • Y represents a methylene group
  • Y represents an ethylene group and the resulting 5-membered ring may or may not carry one or two fluorine atoms, a hydroxy group or an oxo group in position 4, or may or may not be unsaturated, or
  • Y represents --CH 2 --O--, --CH 2 --S--, --CH 2 --SO--, with the heteroatom functionality in position 4, or
  • Y represents a n-propylene group and the resulting 6-membered ring may or may not carry in position 5 one fluorine atom, a hydroxy group or an oxo group, carry two fluorine atoms in one of positions 4 or 5 or be unsaturated in position 4 and 5, or carry in position 4 an alkyl group with 1 to 4 carbon atoms, or
  • Y represents --CH 2 --O--CH 2 --, --CH 2 --S--CH 2 --, --CH 2 --SO--CH 2 --, or
  • Y represent --CH 2 --CH 2 --CH 2 --CH 2 --CH 2 --;
  • R 3 represents an alkyl group having 1-4 carbon atoms, or
  • R 3 represents a Si(Me) 3 group
  • R 5 represents H or an alkyl group having 1 to 4 carbon atoms, preferably H or a methylgroup, or
  • R 5 represents --(CH 2 ) p --COOR 51 , where p is 0, 1 or 2 and R 51 is H or an alkyl group having 1 to 4 carbon atoms, preferably p is 0 and R 51 is H;
  • n is an integer 0, 1, 2, 3 or 4, preferably 1, 2, 3;
  • B represents a structural fragment of Formula IVa, IVb, IVc or IVd, preferably IVa or IVb
  • X 1 , X 2 , X 3 , X 4 , X 5 and X 6 are as defined above;
  • r is an integer 0 or 1;
  • R 6 is H or an alkyl group having 1-4 carbon atoms, preferably H;
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--C(NH)--NH 2 and r is 0 or 1, or
  • X 1 , X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0 or 1, or
  • X 1 and X 3 are NH, X 2 is C ⁇ NH, X 4 is CH 2 and r is 0 or 1, or
  • X 1 and X 4 are CH 2 , X 2 is C ⁇ NH, X 3 is NH and r is 0 or 1 or
  • X 1 is CH 2 , X 2 and X 4 are NH, X 3 is C ⁇ NH and r is 1, or
  • X 1 is absent
  • X 2 and X 4 are CH 2
  • X 3 is CH--C(NH)--NH 2 and r is 0,
  • X 1 is absent, X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0;
  • X 1 is absent, X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0, or
  • X 1 and X 3 are NH, X 2 is C ⁇ NH, X 4 is CH 2 r is 1;
  • X 5 represents C(NH)--NH 2 or NH--C(NH)--NH 2 , preferably C(NH)--NH 2 ;
  • X 6 represents CH or N
  • the invention relates to compounds of Formula Ia,
  • a 1 represents a structural fragment of Formula IIa
  • k 0 or 1
  • R 1 represents R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms, particularly methylene, ethylene and R 11 is H;
  • R 2 represents H
  • R 3 represents a cyclohexyl group
  • a 2 represents a structural fragment of Formula IIIa
  • Y represents a methylene group, an ethylene group, or a n-propylene group and the resulting 6-membered ring may or may not carry in position 4 an alkyl group with 1 to 4 carbon atoms, preferably Y represents methylene, ethylene;
  • R 5 represents H
  • X 1 is absent, X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 , r is 0 and n is 1 or 2;
  • X 1 , and X 3 are NH, X 2 is C ⁇ NH, X 4 is CH 2 , r is 1 and n is 2, or
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--C(NH)--NH 2 , r is 1 and n is 1, or
  • X 1 , X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 , r is 0 or 1 and n is 1 or 2, or
  • X 5 represents C(NH)--NH 2
  • R 6 is H
  • n 1
  • Preferred compounds of the invention are:
  • a 1 represents a structural fragment of formula IIa, IIb or IIe, preferably IIa or IIb;
  • k is an integer 0, 1, 2, 3 or 4, preferably 0, 1;
  • q is an integer 0, 1, 2, or 3, preferably 1;
  • R 1 represents H, an alkyl group having 1 to 4 carbon atoms, or R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted in the position which is alpha to the carbonyl group, and the alpha substituent is a group R 17 --(CH 2 ) p --, wherein p is 0, 1 or 2 and R 17 is methyl, phenyl, OH, COOR 12 , CONHR 12 , where R 12 is H or an alkyl group having 1 to 4 carbon atoms, and R 11 is H or an alkyl group having 1 to 6 carbon atoms, or
  • R 1 represents Ph(4--COOR 12 )--CH 2 --, where R 12 is H or an alkyl group having 1 to 4 carbon atoms, or
  • R 1 represents R 13 --NH--CO--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 13 is H or an alkyl group having 1 to 4 carbon atoms or --CH 2 COOR 12 where R 12 is as defined above, or
  • R 1 represents R 12 OOC--CH 2 --OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 12 is as defined above, or
  • R 1 represents R 14 SO 2 --, Ph(4--COOR 12 )--SO 2 --, Ph(3--COOR 12 )--SO 2 , Ph(2--COOR 12 )--SO 2 --, where R 12 is as defined above and R 14 is an alkylgroup having 1-4 carbon atoms, or
  • R 1 represents --CO--R 15 , wherein R 15 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--OR 15 , where R 15 is as defined above, or
  • R 1 represent --CO--(CH 2 ) p --COOR 12 , where R 12 is as defined above and p is 0, 1 or 2, or
  • R 1 represents --CH 2 PO(OR 16 ) 2 , --CH 2 SO 3 H or --CH 2 --(5-(1H)-tetrazolyl), where R 16 is, individually at each occurrence, H, methyl or ethyl;
  • R 2 represents H or an alkyl group having 1 to 4 carbon atoms or R 21 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and R 21 is H or an alkyl group having 1 to 4 carbon atoms;
  • R 3 represents an alkyl group having 1-4 carbon atoms, and the alkyl group may or may not carry one or more fluorine atoms, or
  • R 3 represents a cyclopentyl, cyclohexyl- or a phenyl group which may or may not be substituted with an alkyl group having 1 to 4 carbon atoms, or
  • R 3 represents a phenyl group substituted with a OR 31 group, where R 31 is H or an alkyl group having 1 to 4 carbon atoms and k is 0, 1, or
  • R 3 represents a 1-naphthyl or 1-naphthyl group and k is 0, 1, or
  • R 3 represent a cis- or trans-decalin group and k is 0,1, or
  • R 3 represents 4-pyridyl, 3-pyrrolidyl or 3-indolyl which may or may not be substituted with a OR 31 group, where R 31 is as defined above and k is 0, 1, or
  • R 3 represents Si(Me) 3 or CH(R 32 ) 2 , wherein R 32 is a cyclohexyl- or phenyl group;
  • R 4 represents H, an alkyl group having 1 to carbon atoms, a cyclohexyl or a phenyl group, preferably H;
  • a 2 represents a structural fragment of formula IIIb or IIIc, preferably IIIb
  • p is an integer 0, 1 or 2;
  • n is an integer 1, 2, 3, or 4, preferably 2, 3;
  • R 3 is as defined above;
  • n is an integer 0, 1, 2, 3 or 4, preferably 1,2,3;
  • B represents a structural fragment of Formula IVa, IVb, IVc or IVd, preferably IVa or IVb;
  • X 1 , X 2 , X 3 , X 4 are as defined above;
  • R 6 is H or an alkyl group having 1-4 carbon atoms, preferably H or a methyl group
  • r is an integer 0 or 1;
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--C(NH)--NH 2 and r is 0 or 1, or
  • X 1 , X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0 or 1, or
  • X 1 and X 3 are NH, X 2 is C ⁇ NH, X 4 is CH 2 and r is 0 or 1, or
  • X 1 and X 4 are CH 2 , X 2 is C ⁇ NH, X 3 is NH and r is 0 or 1, or
  • X 1 is CH 2 , X 2 and X 4 are NH, X 3 is C ⁇ NH and r is 1, or
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--NH--C(NH)--NH 2 and r is 0 or 1,
  • X 1 is absent
  • X 2 and X 4 are CH 2
  • X 3 is CH--C(NH)--NH 2 and r is 0, or
  • X 1 is absent, X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 0;
  • X 1 , X 2 and X 4 are CH 2 , X 3 is CH--C(NH)--NH 2 and r is 1 or,
  • X 1 , X 2 and X 4 are CH 2 , X 3 is N--C(NH)--NH 2 and r is 1;
  • X 5 represents C(NH)--NH 2 or NH--C(NH)--NH 2 , preferably C(NH)--NH 2 ;
  • X 6 represents CH or N.
  • Preferred compound of the invention are:
  • compounds of the general Formula V are potent inhibitors of serine proteases, especially thrombin and kininogenases such as kallikrein after oral or parenteral administration:
  • a 1 represents a structural fragment of Formula IIa, IIb, IIc, IId or IIe; ##STR5## wherein: k is an integer 0, 1, 2, 3 or 4;
  • n is an integer 1, 2, 3 or 4;
  • q is an integer 0, 1, 2 or 3;
  • R 1 represents R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted in the position which is alpha to the carbonyl group, and the alpha substituent is a group R 17 --(CH 2 ) p --, wherein p is 0, 1 or 2 and R 17 is COOR 12 , CONHR 12 , where R 12 is H or an alkyl group having 1 to 4 carbon atoms or a benzyl group, and R 11 is H or an alkyl group having 1 to 6 carbon atoms, or a benzyl group, or
  • R 1 represents Ph(4--COOR 12 )--CH 2 --, where R 12 is as defined above, or
  • R 1 represents R 13 --NH--CO--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 13 is H or an alkyl group having 1 to 4 carbon atoms or --CH 2 COOR 12 , where R 12 is as defined above, or
  • R 1 represents R 12 OOC--CH 2 --OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 12 is as defined above, or
  • R 1 represents R 14 SO 2 --, Ph(4--COOR 12 )--SO 2 --, Ph(3--COOR 12 )--SO 2 --, Ph(2--COOR 12 )--SO 2 , where R 12 is as defined above and R 14 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--R 15 , wherein R 15 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--OR 15 , where R 15 is as defined above or
  • R 1 represent --CO--(CH 2 ) p --COOR 12 , where R 12 is as defined above and p is an interger 0, 1 or 2, or
  • R 2 represents H or an alkyl group having 1 to 4 carbon atoms or R 21 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and, where R 21 is H, an alkyl group having 1 to 4 carbon atoms or a benzyl group;
  • R 3 represents an alkyl group having 1-4 carbon atoms, and the alkyl group may or may not carry one or more flourine atoms, or
  • R 3 represents a cyclopentyl, cyclohexyl- or a phenyl group which may or may not be substituted with an alkyl group having 1 to 4 carbon atoms, or
  • R 3 represents a phenyl group substituted with a OR 31 group, where R 31 is H or an alkyl group having 1 to 4 carbon atoms and k is 0, 1, or
  • R 3 represents a 1-naphthyl or 2-naphthyl group and k is 0, 1, or
  • R 3 represent a cis- or trans-decalin group and k is 0, 1, or
  • R 3 represents 4-pyridyl, 3-pyrrolidyl or 3-indolyl which may or may not be substituted with a OR 31 group, where R 31 is as defined above and k is 0, 1, or
  • R 3 represents Si(Me) 3 or CH(R 32 ) 2 , wherein R 32 is a cyclohexyl- or a phenyl group;
  • R 4 represents H, an alkyl group having 1 to 4 carbon atoms, a cyclohexyl- or a phenyl group;
  • a 2 , B and n are defined as described under Formula I above;
  • D is Z or (Z) 2 , wherein Z represents a benzyloxycarbonyl group.
  • the benzyloxycarbonyl group (Z or (Z) 2 ) will bind to the amidino- or guanidino nitrogens present in B.
  • a 1 represents a structural fragment of Formula IIa, IIb, IIc or IId, preferably IIa or IIb;
  • k is an integer 0, 1, 2, 3 or 4, preferably 0, 1;
  • q is an integer 0, 1, 2 or 3, preferably 1;
  • R 1 represents R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted in the position which is alpha to the carbonyl group, and the alpha substituent is a group R 17 --(CH 2 ) p --, wherein p is 0,1 or 2 and R 17 is COOR 12 , CONHR 12 , where R 12 is H, an alkyl group having 1 to 4 carbon atoms or a benzyl group, and R 11 is H or an alkyl group having 1 to 6 carbon atoms, or a benzyl group, or
  • R 1 represents Ph(4--COOR 12 )--CH 2 --, where R 12 is as defined above, or
  • R 1 represents R 13 --NH--CO--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 13 is H or an alkyl group having 1 to 4 carbon atoms or --CH 2 COOR 12 where R 12 is as defined above, or
  • R 1 represents R 12 OOC--CH 2 --OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 12 is as defined above, or
  • R 1 represents R 14 SO 2 --, Ph(4--COOR 12 )--SO 2 --, Ph(3--COOR 12 )--SO 2 --, Ph(2--COOR 12 )--SO 2 -- where R 12 is as defined above and R 14 is an alkylgroup having 1-4 carbon atoms, or
  • R 1 represents --CO--R 15 , wherein R 15 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--OR 15 , where R 15 is as defined above, or
  • R 1 represent --CO--(CH 2 ) p --COOR 12 , where R 12 is as defined above and p is an interger 0, 1 or 2, or
  • R 1 represents R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and R 11 is as defined above.
  • R 2 represents H or an alkyl group having 1 to 4 carbon atoms, or R 21 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and R 21 is H or an alkyl group having 1 to 4 carbon atoms or a benzyl group;
  • R 3 represents an alkyl group having 1-4 carbon atoms, and the alkyl group may or may not carry one or more fluorine atoms, or
  • R 3 represents a cyclopentyl, cyclohexyl- or a phenyl group which may or may not be substituted with an alkyl group having 1 to 4 carbon atoms, or
  • R 3 represents a 1-naphthyl or 2-naphthyl group and k is 0, 1, or
  • R 3 represent a cis- or trans-decalin group and k is 0, 1, or
  • R 3 represents Si(Me) 3 or CH(R 32 ) 2 , wherein R 32 is a cyclohexyl- or phenyl group;
  • R 4 represents an alkyl group having 1 to 4 carbon atoms, a cyclohexyl or a phenyl group, preferably a cyclohexyl or a phenyl group;
  • a 2 , B and n are defined as described under Formula Ia above;
  • D is Z or (Z) 2 ;
  • Z represents a benzyloxycarbonyl group.
  • R 11 is H, an alkyl group having 1 to 6 carbon atoms or a benzyl group.
  • Preferred compounds having Formula Va are:
  • Particularly preferred compounds are:
  • a 1 represents a structural fragment of formula IIa, IIb or IIe, preferably IIa or IIb;
  • k is an integer 0, 1, 2, 3 or 4, preferably 0, 1;
  • q is an integer 0, 1, 2, or 3, preferably 1;
  • R 1 represents R 11 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted in the position which is alpha to the carbonyl group, and the alpha substituent is a group R 17 --(CH 2 ) p --, wherein p is 0, 1 or 2 and R 17 is COOR 12 , CONHR 12 , where R 11 is H or an alkyl group having 1 to 4 carbon atoms, and R 11 is H or an alkyl group having 1 to 6 carbon atoms, or a benzyl group, or
  • R 1 represents Ph(4--COOR 12 )--CH 2 --, where R 12 is as defined above, or
  • R 1 represents R 13 --NH--CO--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 13 is H or an alkyl group having 1 to 4 carbon atoms or --CH 2 COOR 12 where R 12 is as defined above, or
  • R 1 represents R 12 OOC--CH 2 --OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and is possibly substituted alpha to the carbonyl with an alkyl group having 1 to 4 carbon atoms and where R 12 is as defined above, or
  • R 1 represents R 14 SO 2 --, Ph(4--COOR 12 )--SO 2 --, Ph(3--COOR 12 )--SO 2 , Ph(2--COOR 12 )--SO 2 --, where R 12 is as defined above and R 14 is an alkylgroup having 1-4 carbon atoms, or
  • R 1 represents --CO--R 15 , wherein R 15 is an alkyl group having 1-4 carbon atoms, or
  • R 1 represents --CO--OR 15 where R 15 is as defined above, or
  • R 1 represent --CO--(CH 2 ) p --COOR 12 , where R 12 is as defined above and p is 0, 1 or 2, or
  • R 2 represents H or an alkyl group having 1 to 4 carbon atoms or R 21 OOC--alkyl-, where the alkyl group has 1 to 4 carbon atoms and R 21 is H, an alkyl group having 1 to 4 carbon atoms or a benzyl group;
  • R 3 represents an alkyl group having 1-4 carbon atoms, and the alkyl group may or may not carry one or more fluorine atoms, or
  • R 3 represents a cyclopentyl, cyclohexyl- or a phenyl group which may or may not be substituted with an alkyl group having 1 to 4 carbon atoms, or
  • R 3 represents a phenyl group substituted with a OR 31 group, where R 31 is H or an alkyl group having 1 to 4 carbon atoms and k is 0, 1, or
  • R 3 represents a 1-naphthyl or 1-naphthyl group and k is 0, 1, or
  • R 3 represent a cis- or trans-decalin group and k is 0,1, or
  • R 3 represents 4-pyridyl, 3-pyrrolidyl or 3-indolyl which may or may not be substituted with a OR 31 group, where R 31 is as defined above and k is 0, 1, or
  • R 3 represents Si(Me) 3 or CH(R 32 ) 2 , wherein R 32 is a cyclohexyl- or phenyl group;
  • R 4 represents H, an alkyl group having 1 to carbon atoms, a cyclohexyl or a phenyl group, preferably H;
  • a 2 , B and n are defined as described under Formula Ib above;
  • D represents Z or (Z) 2 .
  • Preferred integers, groups or combinations and particularly preferred combinations are the same as described in Formula Ib above but R 11 is H, an alkyl group having 1 to 6 carbon atoms or a benzyl group.
  • Preferred compounds having Formula Vb are:
  • the invention relates to novel use of a compound of the formula: ##STR6## as a starting material in synthesis of a peptidic serine protease inhibitor, and in particular in synthesis of peptidic thrombin inhibitors or kininogenases inhibitors. It can be used as such or having the amidino group either mono- or diprotected at the nitrogens with a protective group such as benzyloxy carbonyl. Protection of the amidino derivatives is carried out by methods known in the art for amidino compounds. This compound is named "1-amidino-4-aminomethylbenzene" or "H-Pab" herein. The compound has been previously disclosed in inter alia Biochem. Pharm. vol 23, p. 2247-2256.
  • the structural fragment of the formula ##STR7## has however not been previously disclosed as a structural element in a pharmaceutically active compound, especially a peptic compound.
  • the fragment renders a serine protease inhibitor, and in particular a thrombin inhibitor or kininogenases inhibitor valuable.
  • the invention relates to novel use of a compound of the formula: ##STR8## as a starting material in synthesis of a thrombin inhibitor.
  • the compound may have the amidino group either mono- or diprotected at the nitrogens with a protective group such as benzyloxy carbonyl. Protection of the amidino derivatives is carried out by methods known in the art for amidino compounds. This compound is named "1-amidino-4-aminomethyl cyclohexane" or "H-Pac" herein.
  • the invention relates to a novel compound of the formula: ##STR10## and the use of said compound as a starting material in synthesis of a serine protease inhibitor, especially a thrombin inhibitor or kininogenase inhibitor.
  • the compound may have the amidino group either mono- or diprotected at the nitrogens with a protective group such as benzyloxy carbonyl. Protection of the amidino derivatives is carried out by methods known in the art for amidno compounds. This compound is named "4-aminoethyl-1-amidino piperidine" or "H-Rig" herein.
  • the structural fragment of the formula ##STR11## has however not been previously disclosed as a structural element in a pharmaceutically active compound, especially a peptic compound.
  • the fragment renders a serine protease inhibitor, and in particular a thrombin inhibitor or kininogenases inhibitor varuable.
  • the invention relates to a novel compound of the formula: ##STR12## and the use of said compound as a starting material in synthesis of a serine protease inhibitor especially a thrombin inhibitor or kininogenase inhibitor.
  • the compound may have the amidino group either mono- or diprotected at the nitrogens with a protective group such as benzyloxy carbonyl. Protection of the amidino derivatives is carried out by methods known in the art for amidino compounds. This compound is named "1,3-diaza-2-imino-4-aminoethyl cyclohexane" or "H-Itp" herein.
  • the structural fragment of the formula ##STR13## has however not been previously disclosed as a strucural element in a pharmaceutically active compound, especially a peptic compound.
  • the fragment renders a serine protease inhibitor, and in particular a thrombin inhibitor or kininogenases inhibitor varuable.
  • the invention relates to novel compounds of the formula: ##STR14## where n is 1 or 2
  • the compound may have the amidino group either mono- or diprotected at the nitrogens with a protective group such as benzyloxy carbonyl. Protection of the amidino derivatives is carried out by methods known in the art for amidino compounds. These compounds are named:
  • the structural fragment of the formula ##STR15## has however not been previously disclosed as a structural element in a pharmaceutically active compound, especially a peptic compound.
  • the fragment renders a serine protease inhibitor, and in particular a thrombin inhibitor or kininogenases inhibitor valuable.
  • a further embodiment of the invention are the novel compounds having the amidino group mono- or diprotected at the nitrogens with a benzyloxy carbonyl group, examples of such compounds are
  • the invention also provides compositions and methods for the treatment, in a human or animal organism, of conditions where inhibition of thrombin is required and of physiologically disorders especially inflammatory diseases.
  • the thrombin inhibiting compounds of the invention are expected to be useful in particular in animals including man in treatment or prophylaxis of thrombosis and hypercoagulability in blood and tissues. They are furthermore expected to be useful in situations where there is an undesirable excess of the thrombin without signs of hypercoagulability, for example as in Alzheimers disease and pancreatitis.
  • venous thrombosis and pulmonary embolism include venous thrombosis and pulmonary embolism, arterial thrombosis, such as in myocardial infarction, unstable angina, thrombosis-based stroke and peripheral arterial thrombosis and systemic embolism usually from the atrium during arterial fibrillation or from the left ventricule after transmural myocardial infarction.
  • arterial thrombosis such as in myocardial infarction, unstable angina, thrombosis-based stroke and peripheral arterial thrombosis and systemic embolism usually from the atrium during arterial fibrillation or from the left ventricule after transmural myocardial infarction.
  • atherosclerotic diseases such as coronary arterial disease, cerebral arterial disease and peripheral arterial disease.
  • these compounds are expected to have synergistic antithrombotic effects when combined with any antithrombotic agent with a different mechanism of action, such as the antiplatelet agent acetylsalicylic acid. Further, these compounds are expected to be useful together with thrombolytics in thrombotic diseases, in particular myocardial infarction. Further, these compounds have expected utility in prophylaxis for re-occlusion after thrombolysis, percutaneous trans-luminal angioplasty (PTCA) and coronary bypass operations. Further, these compounds have expected utility in prevention of rethrombosis after microsurgery and vascular surgery in general.
  • PTCA percutaneous trans-luminal angioplasty
  • these compounds have expected utility in treatment and prophylaxis of disseminated intravascular coagulation caused by bacteria, multiple trauma, intoxication or any other mechanism. Further, these compounds are expected to be useful in anticoagulant treatment when blood is in contact with foreign surfaces in the body such as vascular grafts, vasculars stemts, vascular catheters, mechanical and biological prosthetic or any other medical device. Further, these compounds have expected utility in anticoagulant treatment when blood is in contact with medical devices outside the body such as during cardiovascular surgery using or heart-lung machine or in haemodialysis.
  • a further expected utility of the anticoagulant compounds of the invention are in rinsing of catheters and mechanical devises used in patients in vivo, and as anticoagulants for preservation of blood, plasma and other blood products in vitro.
  • the antiinflammatory inhibiting compounds of the invention are expected to be useful in particular in animals including man in treatment or prophylaxis of inflammatory diseases such as asthma, rhinitis, pancreatitis, uticaria, inflammatory bowel diseases, and arthritis.
  • An effective amount of kininogenase inhibiting compounds with or without a physiologically acceptable carrier or diluent can be used solely or in combination with other therapeutic agents.
  • the compounds inhibit the activity of kallikreins assessed with chromogenic substrates according to known procedures.
  • the anti-inflammatory actions of the present compounds can for example be studied by their inhibition of allergen-induced exudative inflammatory processes in airway mucosa or gut mucosa.
  • the compounds of the invention will normally be administered orally, rectally, dermally, nasally, tracheally, bronchially, parenterally or via inhalation route, in the form of pharmaceutical preparations comprising the active ingredient either as a free base or a pharmaceutical acceptable non-toxic organic or inorganic acid addition salt, e.g. the hydrochloride, hydrobromide, sulphate, hydrosulphate, nitrate, lactate, acetate, citrate, bensoate, succinate, tartrate, trifluoroacetate and the like in a pharmaceutically acceptable dosage form.
  • the compositions may be administered at varying doses.
  • the dosage form may be a solid, semisolid or liquid preparation prepared by per se known techniques.
  • the active substance will constitute between 0.1 and 99% by weight of the preparation, more specifically between 0.1 and 50% by weight for preparations intended for parenteral administration and between 0.2 and 75% by weight for preparations suitable for oral administration.
  • Suitable daily doses of the compounds of the invention in therapeutical treatment of humans are about 0.001-100 mg/kg body weight at peroral administration and 0.001-50 mg/kg body weight at parenteral administration.
  • a further objective of the invention is the mode of preparation of the compounds.
  • the compounds of Formula I and V may be prepared by processes comprise coupling of an N-terminally protected dipeptide or aminoacid, when a N-terminally amino acid is used a second aminoacid is added afterwards using standard methods to a compound
  • n is an integer 0, 1, 2, 3 or 4
  • X is B or B-D where B is as defined in formula I and D is as defined in formula V as such or having the guanidino or amidino nitrogens either mono or diprotected with an amin protecting group such as a benzyloxy carbonyl-, tert-butyloxy carbonyl- or p-toluenesulphonyl- group or X is a group transferable into B followed by removal of the protectary group(s) or deprotection of the N-terminal nitrogen followed by alkylation of the N-terminal nitrogen and if desired deprotection by known methods and if desired forming a physiologically acceptable salt, and in those cases where the reaction results in a mixture of stereoisomers, these are optionally separated by standard chromatographic or re-crystallisation techniques, and if desired a single stereoisomer is isolated.
  • N-terminally protected dipeptide selected from A 1 and A 2 in Formulas I or V and prepared by standard peptide coupling, with a compound ##STR28## using standard peptide coupling, shown in the formula ##STR29## wherein n is as defined in Formula I, W 1 is an N-terminal amino protecting group such as tert-butyloxy carbonyl or benzyloxy carbonyl and W 3 is H or an amino protecting group such as aryl sulfonyl, benzyloxy carbonyl or tert-butyloxy carbonyl.
  • the final compounds can be made in any of the following ways: Removal of the protecting group(s), or a selective deprotection of the W 1 -group (W 1 must be orthogonal to W 3 ) followed by alkylation of the N-terminal nitrogen and if desired deprotection.
  • Mass spectra were recorded on a Finnigan MAT TSQ 700 triple quadropole mass spectrometer equipped with an electrospray interface.
  • the 1 H NMR and 13 C NMR measurements were performed on BRUKER AC-P 300 and BRUKER AM 500 spectrometers, the former operating at a 1 H frequency of 500.14 MHz and a 13 C frequency of 125.76 MHz and the latter at 1 H and 13 C frequency of 300.13 MHz and 75.46 MHz respectively.
  • the samples were about 10-50 mg dissolved in 0.6 ml of either of the following solvents; CDCl 3 (isotopic purity>99.8%), CD 3 OD (isotopic purity>99.95%), D 2 O (isotopic purity>99.98%) or DMSO-d 6 (isotopic purity>99.8%). All solvents where purchased from Dr. Glaser AG, Basel.
  • the 1 H and 13 C chemical shift values in CDCl 3 and CD 3 OD are relative to tetramethylsilane as an external standard.
  • the 1 H chemical shifts in D 2 O are relative to the sodium salt of 3-(trimethylsilyl)-d 4 -propanoic acid and the 13 C chemical shifts in D 2 O are referenced relative to 1,4-dioxane (67.3 ppm), both as external standard. Calibrating with an external standard may in some cases cause minor shift differences compared to an internal standard, however, the difference in 1 H chemical shift is less than 0.02 ppm and in 13 C less than 0.1 ppm.
  • Thin-Layer Chromatography was carried out on commercial Merck Silicagel 60F 254 coated glass or aluminium plates. Visualisation was by a combination of UV-light, followed by spraying with a solution prepared by mixing 372 ml of EtOH(95%), 13.8 ml of concentrated H 2 SO 4 , 4.2 ml of concentrated acetic acid and 10.2 ml of p-methoxy benzaldehyde or phosphomolybdic acid reagent (5-10 w.t % in EtOH(95%)) and heating.
  • Reversed phase high-performance liquid chromatography (in the Examples referred to as RPLC) was performed on a Waters M-590 instrument equipped with three reverse phase Kromasil 100,C8 columns (Eka-Nobel) having different dimensions for analytical (4.6 mm ⁇ 250 mm), semipreparative (1" ⁇ 250 mm) and preparative (2" ⁇ 500 mm) chromatography detecting at 226 nm.
  • Freeze-drying was done on a Leybold-Heraeus, model Lyovac GT 2, apparatus.
  • triphenylphosphine 26.3 g (100 mmol) triphenylphosphine was added at room temperature to the 4-(benzyloxycarbonylamidino) benzyl azide from (iii) above dissolved in 160 ml THF. After 16 h an additional 6.6 g (25 mmol) triphenylphosphine was added and the solution was allowed to stand for 4 h before removal of the solvent in vacuo. The residue was dissolved in methylene Chloride and extracted with 2M HCl. The aqueous phase was washed with methylene chloride and ether and was subsequently made alcaline with 3.75M sodium hydroxide solution. Extraction with methylene chloride followed by drying (K 2 CO 3 ) and removal of the solvent in vacuo gave 20 g (The total yield starting from cyanobenzyl bromide is 28%) of a yellow oil which solidified on standing.
  • the brown powder was dissolved in 100 ml EtOAc and the organic phase was washed with 1 ⁇ 50 ml+1 ⁇ 25 ml 1M KHSO 4 .
  • the combined acidic phase was made alkaline with 2M NaOH and extracted with 1 ⁇ 200+1 ⁇ 75 ml EtOAc.
  • the combined organic phase was dried and evaporated to give 5.2 g of the title compound as a white powder.
  • Boc-Pig(Z) was dissolved in 100 mL ethyl acetate saturated with HCl (g). The mixture was allowed to stand for one hour and then evaporated. The residue was dissolved in water and washed with a mixture of diethylether and ethyl acetate. The water layer was freeze-dried to yield 4.0 g (91%) of the title compound.
  • the mixture was filtered through celite and the celite was rinsed with additional water.
  • the tetrahydrofuran was evaporated and the aqueous phase was washed with ethyl acetate.
  • the aqueous phase was made alkaline with 2M NaOH and extracted with methylene chloride three times.
  • the combined organic phase was washed with water, dried (Na 2 SO 4 ) and evaporated.
  • the product was used in the following step without further purification.
  • L-Pipecolinic acid 4.0 g (0.031 mol) was slurried in 100 ml of abs. ethanol and HCl (g) was carefully bubbled through until a clear solution was obtained. It was cooled in an ice bath and 17 ml of thionyl chloride was added dropwise over 15 min. The ice bath was removed and the mixture was refluxed for 2.5 h. The solvent was evaporated and the product was obtained as its hydrochloride salt in a quantitative yield.
  • Boc-(R)-Pgl-OH 32.6 g (0.13 mol) was dissolved in 300 ml of methanol and 5 g of Rh/Al 2 O 3 was added. The solution was hydrogenated at 5.2 to 2.8 MPa for 3 days. After filtration and evaporation of the solvent NMR showed the presence of about 25% of the methyl ester of the title compound.
  • the crude material was dissolved in 500 ml of THF and 300 ml of water and 20 g of LiOH were added. The mixture was stirred overnight and the THF was evaporated. The remaining water phase was acidified with KHSO 4 and extracted three times with ethyl acetate. The combined organic layer was washed with water, dried (Na 2 SO 4 ) and evaporated to give 28.3 g (83%) of the desired product.
  • Boc-(R)Cha-OH (1 eq.), HOSu (1.1 eq) and DCC or CME-CDI (1.1 eq) were dissolved in acetonitrile (about 2.5 ml/mmol acid) and stirred at room temperature over night. The precipitate formed during the reaction was filtered off, the solvent evaporated and the product dried in vacuo. (When CME-CDI was used in the reaction the residue, after evaporation of the CH 3 CN, was dissolved in EtOAc and the organic phase washed with water and dried). Evaporation of the solvent gave the title compound.
  • Boc-(R)Hop-OH (See above), 3.2 g (11.46 mmol) was dissolved in methanol (75 ml). Rhodium on activated aluminium oxide (Rh/Al 2 O 3 ), 0.5 g was added and the mixture was stirred under a hydrogen atmosphere at 0.41 MPa for 18 h. The catalyst was filtered off through hyflo and the solvent evaporated giving the product in almost quantitative yield.
  • Boc-(R)Cgl-Aze-OMe was carried out according to the procedure described for Boc-(R)Cha-Pic-OEt (vide infra).
  • the product was crystallized from EtOH/acetone/water (1/1/3.95) yield 80%.
  • Pivaloyl chloride (1.0 ml, 8.1 mmol) was added to a solution of Boc-(R)Cgl-OH (2.086 g, 8.1 mmol) and triethyl amine (1.13 ml, 8.1 mmol) in toluene (25 ml) and DMF (5 ml).
  • the reaction mixture was slowly allowed to warm up to room temperature and after 24 h it was diluted with water and extracted with toluene. After washing with 0.3M KHSO 4 , 10% Na 2 CO 3 and brine the solvent was removed in vacuo to give 2.52 g (81%) of colorless oil which was used without further purification.
  • Boc-(R)Cha-Pic-OH starting from Boc-(R)Cha-OH and H-Aze-OEt x HCl (vide infra).
  • Boc-(R)Cha-Pro-OH Starting from Boc-(Me)(R)Cha-OSu and H-Pro-OH.
  • Boc-(R)Cha-OH 6.3 g (0.023 mol) was dissolved in 150 ml of CH 2 Cl 2 .
  • the solution was cooled in an ice bath and 6.3 g (0.047 mol) of N-hydroxybenzotriazole and 11.2 g (0.0265 mol) of CME-CDI were added.
  • the ice bath was removed after 15 min and the reaction mixture was stirred for 4 h at room temperature.
  • the solvent was evaporated and the residue dissolved in 150 ml of DMF and cooled in an ice bath.
  • Boc-(R)Cha-Pic-OEt 5.6 g (0. 014 mol) was mixed with 100 ml of THF, 100 ml of water and 7 g of LiOH. The mixture was stirred at room temperature overnight. The THF was evaporated and the aqueous solution was acidified with KHSO 4 (aq) and extracted three times with ethyl acetate. The combined organic phase was washed with water, dried (Na 2 SO 4 ) and evaporated to give 4.9 g (94%) of Boc-(R)Cha-Pic-OH which was used without further purification. The compound can be crystallized from diisopropyl ether/hexane.
  • Boc-(R)Hoc-Aze-OEt was dissolved in 10 ml THF and 0.59 g of LiOH in 10 ml water was added. After stirring for 24 hours 2M KHSO 4 was added and the THF was removed in vacuo. The aqueous phase was then made acidic with more 2M KHSO 4 and extracted with ethyl acetate, dried over Na 2 SO 4 and evaporated to give 0.5 g (85%) of the title compound.
  • Boc-(R)Cha-Pic-OEt (vide supra) from Boc-(R)Hoc-OH and H-Pic-OMe x HCl.
  • reaction mixture was diluted with toluene and the organic phase was washed with 3 ⁇ 50 ml 0.3M KHSO 4 , 1 ⁇ 50 ml water and dried (Na 2 SO 4 ). Evaporation of the solvent gave the title compound in quantitative yield which was used in the next step without further purification.
  • Boc-(R)Phe-OH (18.8 mmol; purchased from Bachem Feinchemicalien AG), Phe-OMe (20.7 mmol) and 4-dimethylaminopyridine (37.7 mmol) were dissolved in 30 mL of acetonitrile. The solution was cooled to ice-water temperature and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (24.5 mmol) was added. The cooling bath was removed and the reaction mixture was stirred over night. The solvent was then removed under reduced pressure and the residue was dissolved in 50 mL of ethylacetate.
  • Boc-(R)Phe-Phe-OMe (16.4 mmol) was dissolved in 40 mL of tetrahydrofuran and lithiumhydroxide (32.8 mmol) dissolved in 20 mL of water was added rapidly. The reaction mixture was stirred for 3.5 h after which the solvent was removed under reduced pressure. The residue was dissolved in 50 mL of ethylacetate and extracted with 50 mL of 0.5M potassiumsulfate followed by 50 mL of water. The solvent was removed under reduced pressure yielding 8.0 g of Boc-(R)Phe-Phe-OH (quant) as an amorphous solid.
  • the title compound was prepared from 3-aminoethyl-1-benzhydryl azetidine according the procedure for 3-(N-tert-butyloxycarbonylaminomethyl)-1-benzhydryl azetidine, in a yield of 6.5 g (95%).
  • the title compound was prepared from 3-(N-tert-butyloxycarbonylaminoethyl)-1-benzhydryl azetidine according the procedure for 3-(N-tert-butyloxycarbonylaminomethyl) azetidine, in a yield of 1.2 g (70%).
  • the title compound was prepared from 3-(N-tert-butyloxycarbonylaminoethyl) azetidine according the procedure for 3-(N-tert-butyloxycarbonylaminomethyl)-1-(N-benzyloxycarbon ylamidino) azetidine, in a yield of 0.090 g (34%).
  • the alkaline waterphase was extracted with 1 ⁇ 100+1 ⁇ 50 ml CH 2 Cl 2 .
  • the combined organic phase was washed with 1 ⁇ 20 ml water, 1 ⁇ 20 ml Brine and dried(MgSO 4 ). Evaporation of the solvent gave 3.44 g (88%) of the title compound.
  • the acidic waterphase was made alcaline with 1N NaOH to pH>8 and extracted with EtOAc.
  • the organic phase was washed with water, dried (Na 2 SO 4 ), filtered and evaporated in vacuo to give 1.17 g of a residue that was twice subjected to flash chromatography using first CH 2 Cl 2 /MeOH(NH 3 -saturated) 95/5 and then diethylether/MeOH(NH 3 -saturated) 9/1 as eluents to give 0.525 g (36%) of the title compound.
  • the alkylation was also carried out using Benzyl-2-(para-nitrobenzenesulfonyloxy)acetate ((4-NO 2 )Ph-SO 2 -OCH 2 --COOBn) (See Preparation of starting materials) using the same procedure as above to give the title compound in 52% yield.
  • Resolved signals from the minor rotamer appears at ⁇ 0.95 (m), 1.43 (m), 2.24 (m), 2.84 (d), 3.96 (m), 4.03 (m), 7.57 (bd), 7.78 (bd).
  • Boc-(R)Cgl-Pro-OH See preparation of starting materials
  • DMAP 2.38 g (19.47 mmol
  • H-Pab(Z) See preparation of starting materials
  • 1.84 g (6.49 mmol) was mixed in 30 ml acetonitrile.
  • the mixture was cooled to -15° C. and EDC, 1.31 g (6.81 mole) was added. The temperature was allowed to reach room temperature and the mixture was stirred over night. After evaporation, the residue was dissolved in ethyl acetate and 0.3M KHSO 4 -solution.
  • the acidic water phase was extracted three times with ethyl acetate.
  • the amine was obtained by dissolving the dihydrochloride salt in 0.1M NaOH-solution and extracting the water phase three times with ethyl acetate. The organic phase was washed once with brine, dried (Na 2 SO 4 ), filtered and evaporated to yield 1.19 g (97%) of the title compound.
  • the crude product was purified by flash chromatography using a stepwise gradient of CH 2 Cl 2 /MeOH (97/3 followed by 95/5) to give 299 mg of a mixture of two products according to TLC.
  • the mixture was therefore purified further by flash chromatography using a stepwise gradient of ethyl acetate/toluene (9/1, 93/7, 95/5, 100/0) to give 46 mg (9%) of (BnOOC--CH 2 ) 2 --(R)Cgl-Pro-Pab(Z) which eluated first from the column followed by 133 mg (31%) of the desired product BnOOC--CH 2 --(R)Cgl-Pro-Pab(Z).
  • Resolved signals from the minor rotamer appears at ⁇ 0.65 (m), 0.80 (m), 4.00 (m), 5.24 (m), 5.35 (m).
  • the two diastereomers were separated by RPLC using (CH 3 CN/0.1M NH 4 OAc 65/35) as eluent. This diastereomer eluted first from the column. After removal of the acetonitrile in vacuo the water phase was extracted three times with ethyl acetate. The organic phase was washed once with water dried (Na 2 SO 4 ), filtered and evaporated to yield 0.352 g of the title compound as a pure stereoisomer.

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